Hi all my st170 seems to be a bit poorly. Had a similar problem a couple of months ago. When the fuel level drops bellow half a tank the car begins to lose power around 4k and above. Struggles to pick up and will also cut out. Fill up the tank and it's perfect again. I installed a new Ford fuel pump and sender unit 3 months ago and has been perfect up until recently. Could this possibly me the fuel module or pump again.

 

only time I have heard of this issue is when its either pump or regulator issue